Nylon Strings are usually in the following gauge:  (readings are in inches)

                      .028     .032     .040     .030     .035     .043
                         e          B         G         D         A         E
                       1st        2nd      3rd       4th       5th       6th


Silk & Steel Strings are usually in the following gauge: (same order)

                       .011     .014     .023     .028     .038     .047


Steel Strings are usually in the following gauges (same order)

Extra Light   .010     .014     .023     .030     .039     .047
Light             .012     .016     .025     .032     .042     .054
Medium        .013     .017     .026     .035     .045     .056
Heavy           .014     .018     .027     .038     .048     .059


Light Gauge Steel Strings for a 12 String Guitar: (usually can't find any other gauge for 12 strings)

                      .010  .010     .014  .014     .023  .009     .030  .012     .039  .018     .047  .027
                       1st    2nd       3rd    4th       5th    6th       7th     8th       9th   10th      11th  12th


Gman ( o )==#